Deformation prediction of concrete face rockfill dams based on nonlinear dilatancy model
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摘要: 介绍了一种力学概念明确、简单实用的非线性剪胀模型,给出了本构关系的刚度系数矩阵,应用该模型对某堆石坝工程的堆石料真三轴试验进行了计算模拟,并与试验成果进行比较,验证了模型的合理性。在此基础上,分别采用非线性剪胀模型和邓肯E-B模型完整模拟了坝体分层填筑、面板分期以及分期蓄水全过程,对坝体应力与变形、面板应力与变形计算成果进行对比分析,验证了非线性剪胀模型在面板堆石坝静力有限元分析中的适用性。Abstract: A simple and robust nonlinear dilatation constitutive model with clear mechanics concept is introduced, and the stiffness coefficient matrix of constitutive relationship is presented. A kind of coarsed-grained soil is collected from a rockfill dam, and true triaxial consolidated drained shear tests with different values of b are conducted. The comparison between the calculated and test results is employed to validate the nonlinear dilatation model. On this basis, the nonlinear dilatation model and Ducan-Chang E-B model are taken into account respectively to simulate the whole process of layered filling of dam, staged construction of face slab and staged impoundment. Based on the calculated results, the stress-strain relationships of dam body and concrete face slab are compared. Finally, the nonlinear dilatation constitutive model is verified to be available in the static finite element analysis of concrete face rockfill dams.
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